Morphology Data of Astyanax minor
Identification keys
Main Ref. Garavello, J.C.I. and F.A.A. Sampaio, 2010
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Anal-fin and pelvic-fin hooks present only in small specimens and only in males to 60.5 mm SL. Females larger than males; snout length and body depth proportionally larger in females. Males with larger orbital diameter, length of anal, pectoral and pelvic fins.

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

This species is distinguished from all its congeners from Rio IguaƧu by the following set of characters: third infraorbital deep and not in contact with preopercle, leaving an narrow naked area between its border and preopercle; premaxillary external series with 4-6, usually 5 or 6 pentacuspid or heptacuspid teeth; first branchial arch 9-12, usually 10 rakers in upper branch and 13-16, usually 14 or 15 rakers in lower branch; a narrow and elongated vertical humeral bar (Ref. 85756).

Ease of Identification

Meristic characteristics of Astyanax minor

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 36 - 39
Scales in lateral series
Scale rows above lateral line 6 - 7
Scale rows below lateral line 5 - 6
Scales around caudal peduncle 15 - 17
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 8 - 10
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 16 - 23

Paired fins

Pectoral Attributes  
Spines     1
Soft-rays   10 - 14
Pelvics Attributes  
Soft-rays   7 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
Modified by Capuli, Estelita Emily
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